package java0518;

import java.util.Scanner;

// 牛客网 : 三角形
public class Main {
    public static void main (String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            int a = sc.nextInt();
            int b = sc.nextInt();
            int c = sc.nextInt();
            if (func(a, b, c)) {
                System.out.println("Yes");
            } else {
                System.out.println("No");
            }
        }
    }

    public static boolean func(int a, int b, int c) {
        if (a > 0 && b > 0 && c > 0 && a + b > c && a + c > b && b + c > a) {
            return true;
        }
        return false;
    }
}
